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-15=0.4x-5
We move all terms to the left:
-15-(0.4x-5)=0
We get rid of parentheses
-0.4x+5-15=0
We add all the numbers together, and all the variables
-0.4x-10=0
We move all terms containing x to the left, all other terms to the right
-0.4x=10
x=10/-0.4
x=-25
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